"Detectives, working on tips, through the past two weeks put this case together," Derenda said.

Derenda says both made admissions to hanging the dog up three feet in the air, dousing him with lighter fluid, and setting him on fire. Which teen actually started the fire is unclear.

"It is a very disturbing, despicable act. I can't find words. There's no real understanding why somebody would do this," Derenda said.

At this time, police are not giving a motive. The teens were arraigned in court this morning on felony aggravated cruelty to animals. Both have criminal records.

The Jack Russell Terrier survived his first surgery, but will face several more skin graftings and efforts continue to try to save his left leg. He's recovering at the Buffalo Small Animal Hospital on South Elmwood Avenue.

Police have identified the dog's owner, but would not offer further information.